CD4046BCN

Overview

The CD4046BC is a micropower phase-locked loop (PLL) integrated circuit manufactured by Fairchild Semiconductor. It integrates a linear voltage-controlled oscillator (VCO), two phase comparators, a source follower, and a zener diode. The device operates on a wide supply voltage range of 3.0V to 18V with low dynamic power consumption of 70 µW typical at 10 kHz. Key electrical parameters include a maximum operating frequency of 1.2 MHz at 10V supply, VCO linearity of 1% typical, and temperature-frequency stability of 0.06%/°C. It supports both direct and capacitive signal coupling.

Feature Summary

• Micropower operation: 70 µW typical quiescent current at 5V
• Dual phase comparators: Exclusive OR gate (Comparator I) and edge-controlled digital memory network (Comparator II)
• Wide supply voltage range: 3.0V to 18V DC
• Integrated features: Linear VCO, source follower output, and internal zener diode for regulation

Applications

• FM demodulator and modulator
• Frequency synthesis and multiplication
• Data synchronization and conditioning
• Voltage-to-frequency conversion
• Motor speed control

Procurement Notes

Verify the manufacturer designation as Fairchild Semiconductor based on the provided datasheet DS005968. Confirm package availability in PDIP (N16E) or SOIC (M16A). Ensure compliance with the specified absolute maximum ratings, particularly regarding DC supply voltage limits and soldering temperatures, during procurement validation.

Selection Notes

Select Phase Comparator I for applications requiring lock-on to harmonics and high noise rejection. Select Phase Comparator II for applications requiring zero-degree phase shift and precise capture range matching the lock-in range. External components R1, R2, and C1 must be selected within specified ranges (R ≥ 10 kΩ, C ≥ 50 pF) to ensure proper VCO frequency operation and stability.

Part Context

The CD4046BC belongs to the CD4000 series of CMOS logic devices. It is functionally similar to other PLL ICs like the CD4046B but is specifically documented under Fairchild Semiconductor's product line. The 'BC' suffix denotes the specific commercial grade variant available in plastic dual-in-line or small outline packages.

Replacement Considerations

Public confirmed substitute part numbers are not present in the verified local source material.